from pydantic import BaseModel, Field, field_validator


def _coerce_languages(v):
    """Normalize language entries: accept strings or {language, level} dicts."""
    if not isinstance(v, list):
        return v
    out = []
    for item in v:
        if isinstance(item, str):
            out.append(item)
        elif isinstance(item, dict):
            name = item.get("language") or item.get("name") or ""
            level = item.get("level") or item.get("proficiency") or ""
            if name and level:
                out.append(f"{name} ({level})")
            elif name:
                out.append(name)
        else:
            out.append(str(item))
    return out


class Experience(BaseModel):
    title: str
    company: str
    dates: str
    description: str
    bullets: list[str] = []


class Education(BaseModel):
    degree: str
    school: str
    year: str


class Profile(BaseModel):
    name: str
    title: str
    location: str = ""
    email: str = ""
    phone: str = ""
    linkedin: str = ""
    summary: str = ""
    experiences: list[Experience] = []
    education: list[Education] = []
    skills: list[str] = []
    languages: list[str] = []

    @field_validator("languages", mode="before")
    @classmethod
    def _normalize_languages(cls, v):
        return _coerce_languages(v)


class OfferRequirement(BaseModel):
    text: str
    category: str = ""


class Offer(BaseModel):
    title: str
    company: str
    location: str = ""
    description: str
    requirements: list[OfferRequirement] = []
    nice_to_have: list[OfferRequirement] = []


class GapAnalysis(BaseModel):
    matched_skills: list[str] = []
    gaps: list[str] = []
    questions: list[str] = []


class ChatMessage(BaseModel):
    role: str
    # Cap chat content. A realistic answer is a paragraph; 8 KB is already
    # several pages. The cap is the structural defence against
    # "ignore-previous-instructions"-style prompt injections that try to bury
    # the override in a wall of text.
    content: str = Field(default="", max_length=8000)


class ChatRequest(BaseModel):
    profile: Profile
    offer: Offer
    gap_analysis: GapAnalysis
    messages: list[ChatMessage] = []
    ui_language: str = "en"
    known_facts: list[str] = []
    contradictions: list[str] = []
    cv_draft: "CVData | None" = None


class CvAction(BaseModel):
    action: str  # "remove_experience", "add_bullet", "reorder", "edit_field", "merge_experiences"
    target: str = ""  # company name, field path, etc.
    value: str | dict | list = ""  # new value for edits/adds; merge_experiences uses dict
    index: int = -1  # for positional operations


class ChatResponse(BaseModel):
    message: str
    is_complete: bool = False
    cv_actions: list[CvAction] = []
    progress: int = 0  # 0-100, percentage of key points covered


class CompanyContext(BaseModel):
    sector: str = ""
    stage: str = ""
    headcount_start: str = ""
    headcount_end: str = ""
    team_size: str = ""


class RewrittenExperience(BaseModel):
    title: str
    company: str
    dates: str
    bullets: list[str]
    context: CompanyContext | None = None
    # Dedicated UI slots so the chat/LLM stops cramming this into the title.
    # All optional — empty string means "user hasn't filled this yet".
    # camelCase field names so JSON keys match the frontend store directly
    # (the rest of CVData uses snake_case for backwards-compat with persisted
    # client state — only these new fields are camelCase on both sides).
    contractType: str = ""           # "Permanent", "CDI", "Founder", "Freelance"…
    headcountStart: str = ""         # company size when joined, e.g. "12"
    headcountEnd: str = ""           # company size when left / now, e.g. "45"
    exitReason: str = ""             # short reason for leaving (optional)


class CVData(BaseModel):
    name: str
    title: str
    email: str = ""
    phone: str = ""
    linkedin: str = ""
    location: str = ""
    summary: str
    experiences: list[RewrittenExperience]
    education: list[Education]
    skills: list[str]
    languages: list[str] = []
    language: str = "en"
    match_score: int = 0
    strengths: list[str] = []
    improvements: list[str] = []

    @field_validator("languages", mode="before")
    @classmethod
    def _normalize_languages(cls, v):
        return _coerce_languages(v)


class GenerateRequest(BaseModel):
    profile: Profile
    offer: Offer
    gap_analysis: GapAnalysis
    messages: list[ChatMessage]
    ui_language: str = "en"
    tone: str = "startup"  # startup, corporate, creative, minimal
    target_market: str = "france"  # france, europe, us, global


class ToneSamplesRequest(BaseModel):
    profile: Profile
    offer: Offer
    ui_language: str = "en"


class ToneSamples(BaseModel):
    source: str = ""   # the original bullet we rewrote (context for the UI)
    company: str = ""  # which experience it came from
    startup: str = ""
    creative: str = ""
    minimal: str = ""


class ImproveBulletRequest(BaseModel):
    """Per-bullet AI rewrite — Notion-style "improve wording" hover button."""
    text: str = Field(default="", max_length=2000)
    role: str = Field(default="", max_length=200)
    company: str = Field(default="", max_length=200)
    offer_title: str = Field(default="", max_length=200)
    ui_language: str = "en"
    tone: str = "startup"


class ImproveBulletResponse(BaseModel):
    text: str


class AuditCvRequest(BaseModel):
    """End-of-edit CV audit — grammar pass + offer-fit gaps + last-mile advice."""
    cv_data: "CVData"
    offer: Offer
    ui_language: str = "en"


class AuditFinding(BaseModel):
    """One actionable item the user can act on. `where` is a human pointer
    (e.g. 'Summary' or 'Experience 2 / bullet 3') so the UI can render it
    without needing structured paths."""
    where: str = ""
    text: str


class AuditCvResponse(BaseModel):
    grammar: list[AuditFinding] = []         # spelling, grammar, awkward phrasing
    missing_from_offer: list[AuditFinding] = []  # requirements not addressed in the CV
    advice: list[AuditFinding] = []          # more numbers, more bullets, more examples


class ApplyGrammarFixesRequest(BaseModel):
    """Apply only the grammar bucket of an audit to a CV. The LLM is asked to
    return a list of (path, old, new) substitutions which the backend then
    applies mechanically — that way nothing outside the listed fixes can drift,
    and any field the LLM hallucinates a path for just gets skipped."""
    cv_data: "CVData"
    findings: list[AuditFinding] = []
    ui_language: str = "en"


class GrammarSubstitution(BaseModel):
    path: str  # dot-path like "summary" or "experiences.2.bullets.3"
    old: str
    new: str


class ApplyGrammarFixesResponse(BaseModel):
    cv_data: "CVData"
    applied: int = 0  # how many substitutions actually landed
    skipped: int = 0  # paths the LLM returned that didn't resolve / didn't match
    skipped_indices: list[int] = []  # indices into the original findings list that were not applied


class FieldTranslation(BaseModel):
    """A single field to translate, identified by its dot-path within the CV
    (e.g. 'summary', 'experiences.0.bullets.3'). The path is opaque to the
    backend — it just round-trips back in the response so the frontend can
    re-apply the translation to the right field."""
    path: str
    text: str


class TranslateFieldsRequest(BaseModel):
    """Per-field translation for the FR/EN sync flow in the editor. Sent when
    the user toggles language and some fields on the now-active side are
    stale because the user edited the other side."""
    fields: list[FieldTranslation]
    source_language: str  # "en" or "fr"
    target_language: str  # "en" or "fr"


class TranslateFieldsResponse(BaseModel):
    translations: list[FieldTranslation]


class OfferScrapeRequest(BaseModel):
    url: str = ""
    raw_text: str = ""


class AnalyzeRequest(BaseModel):
    profile: Profile
    offer: Offer
    ui_language: str = "en"


class ProjectSummary(BaseModel):
    id: int
    name: str
    offer_title: str
    match_score: int
    template: str
    tone: str
    created_at: str
    updated_at: str


class ProjectDetail(BaseModel):
    id: int
    name: str
    offer_title: str
    offer_url: str
    offer_data: Offer | None = None
    profile_data: Profile | None = None
    gap_analysis: GapAnalysis | None = None
    cv_data: CVData | None = None
    messages: list[ChatMessage] = []
    match_score: int = 0
    template: str = "clean"
    tone: str = "startup"
    created_at: str = ""
    updated_at: str = ""


class CoverLetterData(BaseModel):
    greeting: str = ""
    opening: str = ""  # hook paragraph
    body: str = ""     # 2-3 paragraphs linking experience to role
    closing: str = ""  # call to action
    signature: str = ""
    language: str = "en"


class CoverLetterRequest(BaseModel):
    profile: Profile
    offer: Offer
    cv_data: CVData
    messages: list[ChatMessage] = []
    ui_language: str = "en"
    tone: str = "startup"
    target_market: str = "france"


class KnowledgeEntry(BaseModel):
    id: int = 0
    company: str
    company_context: str = ""
    title: str
    dates: str = ""
    description: str = ""
    facts: dict = {}
    best_bullets: list[str] = []


class FactEntry(BaseModel):
    id: int = 0
    knowledge_id: int = 0
    key: str
    value: str
    source_project_id: int = 0


class KnowledgeBase(BaseModel):
    experiences: list[KnowledgeEntry] = []
    facts: list[FactEntry] = []
    contradictions: list[str] = []