/**
 * Model resolution, scoping, and initial selection
 */
import { modelsAreEqual } from "@mariozechner/pi-ai";
import chalk from "chalk";
import { minimatch } from "minimatch";
import { isValidThinkingLevel } from "../cli/args.js";
import { DEFAULT_THINKING_LEVEL } from "./defaults.js";
/** Default model IDs for each known provider */
export const defaultModelPerProvider = {
    "amazon-bedrock": "us.anthropic.claude-opus-4-6-v1",
    anthropic: "claude-opus-4-6",
    openai: "gpt-5.4",
    "azure-openai-responses": "gpt-5.2",
    "openai-codex": "gpt-5.4",
    google: "gemini-2.5-pro",
    "google-gemini-cli": "gemini-2.5-pro",
    "google-antigravity": "gemini-3.1-pro-high",
    "google-vertex": "gemini-3-pro-preview",
    "github-copilot": "gpt-4o",
    openrouter: "openai/gpt-5.1-codex",
    "vercel-ai-gateway": "anthropic/claude-opus-4-6",
    xai: "grok-4-fast-non-reasoning",
    groq: "openai/gpt-oss-120b",
    cerebras: "zai-glm-4.7",
    zai: "glm-5",
    mistral: "devstral-medium-latest",
    minimax: "MiniMax-M2.7",
    "minimax-cn": "MiniMax-M2.7",
    huggingface: "moonshotai/Kimi-K2.5",
    opencode: "claude-opus-4-6",
    "opencode-go": "kimi-k2.5",
    "kimi-coding": "kimi-k2-thinking",
};
/**
 * Helper to check if a model ID looks like an alias (no date suffix)
 * Dates are typically in format: -20241022 or -20250929
 */
function isAlias(id) {
    // Check if ID ends with -latest
    if (id.endsWith("-latest"))
        return true;
    // Check if ID ends with a date pattern (-YYYYMMDD)
    const datePattern = /-\d{8}$/;
    return !datePattern.test(id);
}
/**
 * Find an exact model reference match.
 * Supports either a bare model id or a canonical provider/modelId reference.
 * When matching by bare id, ambiguous matches across providers are rejected.
 */
export function findExactModelReferenceMatch(modelReference, availableModels) {
    const trimmedReference = modelReference.trim();
    if (!trimmedReference) {
        return undefined;
    }
    const normalizedReference = trimmedReference.toLowerCase();
    const canonicalMatches = availableModels.filter((model) => `${model.provider}/${model.id}`.toLowerCase() === normalizedReference);
    if (canonicalMatches.length === 1) {
        return canonicalMatches[0];
    }
    if (canonicalMatches.length > 1) {
        return undefined;
    }
    const slashIndex = trimmedReference.indexOf("/");
    if (slashIndex !== -1) {
        const provider = trimmedReference.substring(0, slashIndex).trim();
        const modelId = trimmedReference.substring(slashIndex + 1).trim();
        if (provider && modelId) {
            const providerMatches = availableModels.filter((model) => model.provider.toLowerCase() === provider.toLowerCase() &&
                model.id.toLowerCase() === modelId.toLowerCase());
            if (providerMatches.length === 1) {
                return providerMatches[0];
            }
            if (providerMatches.length > 1) {
                return undefined;
            }
        }
    }
    const idMatches = availableModels.filter((model) => model.id.toLowerCase() === normalizedReference);
    return idMatches.length === 1 ? idMatches[0] : undefined;
}
/**
 * Try to match a pattern to a model from the available models list.
 * Returns the matched model or undefined if no match found.
 */
function tryMatchModel(modelPattern, availableModels) {
    const exactMatch = findExactModelReferenceMatch(modelPattern, availableModels);
    if (exactMatch) {
        return exactMatch;
    }
    // No exact match - fall back to partial matching
    const matches = availableModels.filter((m) => m.id.toLowerCase().includes(modelPattern.toLowerCase()) ||
        m.name?.toLowerCase().includes(modelPattern.toLowerCase()));
    if (matches.length === 0) {
        return undefined;
    }
    // Separate into aliases and dated versions
    const aliases = matches.filter((m) => isAlias(m.id));
    const datedVersions = matches.filter((m) => !isAlias(m.id));
    if (aliases.length > 0) {
        // Prefer alias - if multiple aliases, pick the one that sorts highest
        aliases.sort((a, b) => b.id.localeCompare(a.id));
        return aliases[0];
    }
    else {
        // No alias found, pick latest dated version
        datedVersions.sort((a, b) => b.id.localeCompare(a.id));
        return datedVersions[0];
    }
}
function buildFallbackModel(provider, modelId, availableModels) {
    const providerModels = availableModels.filter((m) => m.provider === provider);
    if (providerModels.length === 0)
        return undefined;
    const defaultId = defaultModelPerProvider[provider];
    const baseModel = defaultId
        ? (providerModels.find((m) => m.id === defaultId) ?? providerModels[0])
        : providerModels[0];
    return {
        ...baseModel,
        id: modelId,
        name: modelId,
    };
}
/**
 * Parse a pattern to extract model and thinking level.
 * Handles models with colons in their IDs (e.g., OpenRouter's :exacto suffix).
 *
 * Algorithm:
 * 1. Try to match full pattern as a model
 * 2. If found, return it with "off" thinking level
 * 3. If not found and has colons, split on last colon:
 *    - If suffix is valid thinking level, use it and recurse on prefix
 *    - If suffix is invalid, warn and recurse on prefix with "off"
 *
 * @internal Exported for testing
 */
export function parseModelPattern(pattern, availableModels, options) {
    // Try exact match first
    const exactMatch = tryMatchModel(pattern, availableModels);
    if (exactMatch) {
        return { model: exactMatch, thinkingLevel: undefined, warning: undefined };
    }
    // No match - try splitting on last colon if present
    const lastColonIndex = pattern.lastIndexOf(":");
    if (lastColonIndex === -1) {
        // No colons, pattern simply doesn't match any model
        return { model: undefined, thinkingLevel: undefined, warning: undefined };
    }
    const prefix = pattern.substring(0, lastColonIndex);
    const suffix = pattern.substring(lastColonIndex + 1);
    if (isValidThinkingLevel(suffix)) {
        // Valid thinking level - recurse on prefix and use this level
        const result = parseModelPattern(prefix, availableModels, options);
        if (result.model) {
            // Only use this thinking level if no warning from inner recursion
            return {
                model: result.model,
                thinkingLevel: result.warning ? undefined : suffix,
                warning: result.warning,
            };
        }
        return result;
    }
    else {
        // Invalid suffix
        const allowFallback = options?.allowInvalidThinkingLevelFallback ?? true;
        if (!allowFallback) {
            // In strict mode (CLI --model parsing), treat it as part of the model id and fail.
            // This avoids accidentally resolving to a different model.
            return { model: undefined, thinkingLevel: undefined, warning: undefined };
        }
        // Scope mode: recurse on prefix and warn
        const result = parseModelPattern(prefix, availableModels, options);
        if (result.model) {
            return {
                model: result.model,
                thinkingLevel: undefined,
                warning: `Invalid thinking level "${suffix}" in pattern "${pattern}". Using default instead.`,
            };
        }
        return result;
    }
}
/**
 * Resolve model patterns to actual Model objects with optional thinking levels
 * Format: "pattern:level" where :level is optional
 * For each pattern, finds all matching models and picks the best version:
 * 1. Prefer alias (e.g., claude-sonnet-4-5) over dated versions (claude-sonnet-4-5-20250929)
 * 2. If no alias, pick the latest dated version
 *
 * Supports models with colons in their IDs (e.g., OpenRouter's model:exacto).
 * The algorithm tries to match the full pattern first, then progressively
 * strips colon-suffixes to find a match.
 */
export async function resolveModelScope(patterns, modelRegistry) {
    const availableModels = await modelRegistry.getAvailable();
    const scopedModels = [];
    for (const pattern of patterns) {
        // Check if pattern contains glob characters
        if (pattern.includes("*") || pattern.includes("?") || pattern.includes("[")) {
            // Extract optional thinking level suffix (e.g., "provider/*:high")
            const colonIdx = pattern.lastIndexOf(":");
            let globPattern = pattern;
            let thinkingLevel;
            if (colonIdx !== -1) {
                const suffix = pattern.substring(colonIdx + 1);
                if (isValidThinkingLevel(suffix)) {
                    thinkingLevel = suffix;
                    globPattern = pattern.substring(0, colonIdx);
                }
            }
            // Match against "provider/modelId" format OR just model ID
            // This allows "*sonnet*" to match without requiring "anthropic/*sonnet*"
            const matchingModels = availableModels.filter((m) => {
                const fullId = `${m.provider}/${m.id}`;
                return minimatch(fullId, globPattern, { nocase: true }) || minimatch(m.id, globPattern, { nocase: true });
            });
            if (matchingModels.length === 0) {
                console.warn(chalk.yellow(`Warning: No models match pattern "${pattern}"`));
                continue;
            }
            for (const model of matchingModels) {
                if (!scopedModels.find((sm) => modelsAreEqual(sm.model, model))) {
                    scopedModels.push({ model, thinkingLevel });
                }
            }
            continue;
        }
        const { model, thinkingLevel, warning } = parseModelPattern(pattern, availableModels);
        if (warning) {
            console.warn(chalk.yellow(`Warning: ${warning}`));
        }
        if (!model) {
            console.warn(chalk.yellow(`Warning: No models match pattern "${pattern}"`));
            continue;
        }
        // Avoid duplicates
        if (!scopedModels.find((sm) => modelsAreEqual(sm.model, model))) {
            scopedModels.push({ model, thinkingLevel });
        }
    }
    return scopedModels;
}
/**
 * Resolve a single model from CLI flags.
 *
 * Supports:
 * - --provider <provider> --model <pattern>
 * - --model <provider>/<pattern>
 * - Fuzzy matching (same rules as model scoping: exact id, then partial id/name)
 *
 * Note: This does not apply the thinking level by itself, but it may *parse* and
 * return a thinking level from "<pattern>:<thinking>" so the caller can apply it.
 */
export function resolveCliModel(options) {
    const { cliProvider, cliModel, modelRegistry } = options;
    if (!cliModel) {
        return { model: undefined, warning: undefined, error: undefined };
    }
    // Important: use *all* models here, not just models with pre-configured auth.
    // This allows "--api-key" to be used for first-time setup.
    const availableModels = modelRegistry.getAll();
    if (availableModels.length === 0) {
        return {
            model: undefined,
            warning: undefined,
            error: "No models available. Check your installation or add models to models.json.",
        };
    }
    // Build canonical provider lookup (case-insensitive)
    const providerMap = new Map();
    for (const m of availableModels) {
        providerMap.set(m.provider.toLowerCase(), m.provider);
    }
    let provider = cliProvider ? providerMap.get(cliProvider.toLowerCase()) : undefined;
    if (cliProvider && !provider) {
        return {
            model: undefined,
            warning: undefined,
            error: `Unknown provider "${cliProvider}". Use --list-models to see available providers/models.`,
        };
    }
    // If no explicit --provider, try to interpret "provider/model" format first.
    // When the prefix before the first slash matches a known provider, prefer that
    // interpretation over matching models whose IDs literally contain slashes
    // (e.g. "zai/glm-5" should resolve to provider=zai, model=glm-5, not to a
    // vercel-ai-gateway model with id "zai/glm-5").
    let pattern = cliModel;
    let inferredProvider = false;
    if (!provider) {
        const slashIndex = cliModel.indexOf("/");
        if (slashIndex !== -1) {
            const maybeProvider = cliModel.substring(0, slashIndex);
            const canonical = providerMap.get(maybeProvider.toLowerCase());
            if (canonical) {
                provider = canonical;
                pattern = cliModel.substring(slashIndex + 1);
                inferredProvider = true;
            }
        }
    }
    // If no provider was inferred from the slash, try exact matches without provider inference.
    // This handles models whose IDs naturally contain slashes (e.g. OpenRouter-style IDs).
    if (!provider) {
        const lower = cliModel.toLowerCase();
        const exact = availableModels.find((m) => m.id.toLowerCase() === lower || `${m.provider}/${m.id}`.toLowerCase() === lower);
        if (exact) {
            return { model: exact, warning: undefined, thinkingLevel: undefined, error: undefined };
        }
    }
    if (cliProvider && provider) {
        // If both were provided, tolerate --model <provider>/<pattern> by stripping the provider prefix
        const prefix = `${provider}/`;
        if (cliModel.toLowerCase().startsWith(prefix.toLowerCase())) {
            pattern = cliModel.substring(prefix.length);
        }
    }
    const candidates = provider ? availableModels.filter((m) => m.provider === provider) : availableModels;
    const { model, thinkingLevel, warning } = parseModelPattern(pattern, candidates, {
        allowInvalidThinkingLevelFallback: false,
    });
    if (model) {
        return { model, thinkingLevel, warning, error: undefined };
    }
    // If we inferred a provider from the slash but found no match within that provider,
    // fall back to matching the full input as a raw model id across all models.
    // This handles OpenRouter-style IDs like "openai/gpt-4o:extended" where "openai"
    // looks like a provider but the full string is actually a model id on openrouter.
    if (inferredProvider) {
        const lower = cliModel.toLowerCase();
        const exact = availableModels.find((m) => m.id.toLowerCase() === lower || `${m.provider}/${m.id}`.toLowerCase() === lower);
        if (exact) {
            return { model: exact, warning: undefined, thinkingLevel: undefined, error: undefined };
        }
        // Also try parseModelPattern on the full input against all models
        const fallback = parseModelPattern(cliModel, availableModels, {
            allowInvalidThinkingLevelFallback: false,
        });
        if (fallback.model) {
            return {
                model: fallback.model,
                thinkingLevel: fallback.thinkingLevel,
                warning: fallback.warning,
                error: undefined,
            };
        }
    }
    if (provider) {
        const fallbackModel = buildFallbackModel(provider, pattern, availableModels);
        if (fallbackModel) {
            const fallbackWarning = warning
                ? `${warning} Model "${pattern}" not found for provider "${provider}". Using custom model id.`
                : `Model "${pattern}" not found for provider "${provider}". Using custom model id.`;
            return { model: fallbackModel, thinkingLevel: undefined, warning: fallbackWarning, error: undefined };
        }
    }
    const display = provider ? `${provider}/${pattern}` : cliModel;
    return {
        model: undefined,
        thinkingLevel: undefined,
        warning,
        error: `Model "${display}" not found. Use --list-models to see available models.`,
    };
}
/**
 * Find the initial model to use based on priority:
 * 1. CLI args (provider + model)
 * 2. First model from scoped models (if not continuing/resuming)
 * 3. Restored from session (if continuing/resuming)
 * 4. Saved default from settings
 * 5. First available model with valid API key
 */
export async function findInitialModel(options) {
    const { cliProvider, cliModel, scopedModels, isContinuing, defaultProvider, defaultModelId, defaultThinkingLevel, modelRegistry, } = options;
    let model;
    let thinkingLevel = DEFAULT_THINKING_LEVEL;
    // 1. CLI args take priority
    if (cliProvider && cliModel) {
        const resolved = resolveCliModel({
            cliProvider,
            cliModel,
            modelRegistry,
        });
        if (resolved.error) {
            console.error(chalk.red(resolved.error));
            process.exit(1);
        }
        if (resolved.model) {
            return { model: resolved.model, thinkingLevel: DEFAULT_THINKING_LEVEL, fallbackMessage: undefined };
        }
    }
    // 2. Use first model from scoped models (skip if continuing/resuming)
    if (scopedModels.length > 0 && !isContinuing) {
        return {
            model: scopedModels[0].model,
            thinkingLevel: scopedModels[0].thinkingLevel ?? defaultThinkingLevel ?? DEFAULT_THINKING_LEVEL,
            fallbackMessage: undefined,
        };
    }
    // 3. Try saved default from settings
    if (defaultProvider && defaultModelId) {
        const found = modelRegistry.find(defaultProvider, defaultModelId);
        if (found) {
            model = found;
            if (defaultThinkingLevel) {
                thinkingLevel = defaultThinkingLevel;
            }
            return { model, thinkingLevel, fallbackMessage: undefined };
        }
    }
    // 4. Try first available model with valid API key
    const availableModels = await modelRegistry.getAvailable();
    if (availableModels.length > 0) {
        // Try to find a default model from known providers
        for (const provider of Object.keys(defaultModelPerProvider)) {
            const defaultId = defaultModelPerProvider[provider];
            const match = availableModels.find((m) => m.provider === provider && m.id === defaultId);
            if (match) {
                return { model: match, thinkingLevel: DEFAULT_THINKING_LEVEL, fallbackMessage: undefined };
            }
        }
        // If no default found, use first available
        return { model: availableModels[0], thinkingLevel: DEFAULT_THINKING_LEVEL, fallbackMessage: undefined };
    }
    // 5. No model found
    return { model: undefined, thinkingLevel: DEFAULT_THINKING_LEVEL, fallbackMessage: undefined };
}
/**
 * Restore model from session, with fallback to available models
 */
export async function restoreModelFromSession(savedProvider, savedModelId, currentModel, shouldPrintMessages, modelRegistry) {
    const restoredModel = modelRegistry.find(savedProvider, savedModelId);
    // Check if restored model exists and still has auth configured
    const hasConfiguredAuth = restoredModel ? modelRegistry.hasConfiguredAuth(restoredModel) : false;
    if (restoredModel && hasConfiguredAuth) {
        if (shouldPrintMessages) {
            console.log(chalk.dim(`Restored model: ${savedProvider}/${savedModelId}`));
        }
        return { model: restoredModel, fallbackMessage: undefined };
    }
    // Model not found or no API key - fall back
    const reason = !restoredModel ? "model no longer exists" : "no auth configured";
    if (shouldPrintMessages) {
        console.error(chalk.yellow(`Warning: Could not restore model ${savedProvider}/${savedModelId} (${reason}).`));
    }
    // If we already have a model, use it as fallback
    if (currentModel) {
        if (shouldPrintMessages) {
            console.log(chalk.dim(`Falling back to: ${currentModel.provider}/${currentModel.id}`));
        }
        return {
            model: currentModel,
            fallbackMessage: `Could not restore model ${savedProvider}/${savedModelId} (${reason}). Using ${currentModel.provider}/${currentModel.id}.`,
        };
    }
    // Try to find any available model
    const availableModels = await modelRegistry.getAvailable();
    if (availableModels.length > 0) {
        // Try to find a default model from known providers
        let fallbackModel;
        for (const provider of Object.keys(defaultModelPerProvider)) {
            const defaultId = defaultModelPerProvider[provider];
            const match = availableModels.find((m) => m.provider === provider && m.id === defaultId);
            if (match) {
                fallbackModel = match;
                break;
            }
        }
        // If no default found, use first available
        if (!fallbackModel) {
            fallbackModel = availableModels[0];
        }
        if (shouldPrintMessages) {
            console.log(chalk.dim(`Falling back to: ${fallbackModel.provider}/${fallbackModel.id}`));
        }
        return {
            model: fallbackModel,
            fallbackMessage: `Could not restore model ${savedProvider}/${savedModelId} (${reason}). Using ${fallbackModel.provider}/${fallbackModel.id}.`,
        };
    }
    // No models available
    return { model: undefined, fallbackMessage: undefined };
}
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